Influences of Ammonium Chloride on Extraction and Separation of Rare Earth Ions in P507-hydrochloric Acid System

Aiming at the problem of ammonia nitrogen in the extraction separation process of rare earth solvent, the effect of ammonium chloride on the extraction and separation process of rare earth was studied. The results showed that in the solu- tions of PrCl3 , TmCl3 , NdCl3 , YbCl3 , GdCl2 , SmCl3 which were adopted in the experiments, the solubility of ammonium chloride decreased with the increase of the concentration of rare earth ions which was almost linear relationship except for the solution of SmC13 ; Under the condition that ammonium chloride concentration was in saturated state, the viscosity of rare earth solution increased with the increase of the concentration of rare earth which was almost linear relationship except for the solu- tions of YbC13 and SmC13 ; The addition of ammonium chloride had little influence on the saturation extraction capacity of rare earth, the extraction separation coefficient of rare earth and stripping rate.